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Sept. 17, 1929. R TERR|LD 1,728,221

FUSE AND ITS INSULATOR Filed Sept. 14, 1927 INVENTOR R. Terrlld BY f AQORNEY Patented Sept. 17, 1929 UNETED STATES REG-NAB TERRIIID, OF BROOKLYN, NEW YORK FUSE AND ITS INSULATOR Application filed September 14,1927. Serial No. 219,897.

This invention relates to cartridge-fuses, that is to fuses and their insulators, and the principles embodied in said device are equally applicable to renewable as well as non-renewable cartridge-fuses.

- While my device has a special application tofuses where the current does not exceed 60 amperes, the principles of same may nevertheless in a slightly modified. form-l e applied to fus s, where a considerably greater electric current is involved, or the. knife.- blade shape is employed. "it

With regard to the aforesaid. the ohiectof my invention has thus been to provide. a selfindicating cartridge-fuse of superior quality and construction, for the purpose of eliminating the several objectionable features invariably found in those used at present.

Some of these notable objec ionable fea tures are. that the fuses are difficult to remove with the fingers, that tools are required in some cases for their removal. and

the said tools too often cause short-circuits,

that the spring clips on the cutouts are smnctimes bent and broken off. that frequentl the contact between the fuse. ferrules and the spring clips is bad due to soft metal in the clips, or bending caused by unskilled persons. and above anything else. that the ferrules of the 0-30 amps. fuse are so close together that a shock is likely to be received. when a fuse is being taken out or removed. in

case a person is standing on grounded con ducting material.

The said defects are either remedied, or the cause of same eliminated. in my present device, as will he hereinafter more fully shown. and described.

As this device is very simple of construction, the manufacturing cost of same should be comparatively small.

With the above and other objects in view.

this invention consists of the novel features of construction, combination and arrangements of parts, hereinafter fully described, claimed and illustrated in the accompanying drawings forming parts of this specification,

5 and in which similar characters of reference indicate corresponding parts invall views,

and in which:

Figure l is a side-elevation of my device; Fig. 2 is a longitudinal, transverse sectional view of same; while Figs. 3'and 4 are detail views. v

Referring more particularly to the drawing s, 10 indicates a cartridge-fuse,comprising a preferably double tube, of which the inner one 12 is made of fibre and the outer one 11 of an asbestos composition; naturally the said materials are subject to variation without traversing'the scope of this invention, furthermore the said features are not the'essence of same. 1 v

The said tube 10 has its bottom part at each side formed withan oblong recess, -or slit 22, adapted to admit and securely hold two connecting members 13, the latter comprising each a substantially fiat piece of copper, or brass, bent upon itself to form two substantially annular, tubular sections at their respective ends, and having for their provision. the lower one 18 to establish the immediate connection with the current-conducting-medium, and the upper one, which is embedded in the said tube 10, to be connected to the fuse-link. 15; it being understood that the said arrangement takes the place of the brass-ferrules commonly found in this kind of cartridge-fuses, and whose object it otherwise is to establish the external electrical connection outside of the latter.

The said members 13 are each upon their upper tubular sections-at the outer side thereof formed with a bent or enlarged partial flange 17, which in turn is provided with a tapped bore adapted to receive a screw-bolt 21 for the purpose of detachably connecting a fuse-link 15 to the said members 13.

The aforesaid double-tube is at its ends provided with caps 14 made of a non-conducting material threaded upon the'former, the said caps being made with downwardly extending, flat projections 19, as one of several prominent features, aiming at the object of establishing a perfectly insulated fuse connection.

The said caps 14 are further, as shown, at their end-surfaces provided with a comparatively small central opening 16, which may be covered by any transparent material, and the purpose of which is to permit inspection of the condition of the fuse-link, and the tube inside.

Formed integrally with the said doubletube, at the inner ends of the slits 22, are two downwardly extending, flat projections 20, the latter being of a length almost equal to the members 13, and have for their ob ject to effect on the inner .side of the members 13 an insulating protection equal to that provided by the projections 19 on the outer side thereof.

When the members 13 are mounted in the said double tube by way of the slits 22, as shown in Figs. 1 and 2, the sides of, or walls produced by, the said slits are firmly securing the said members 13 by a clamping action, accentuated by the tightening of the caps 14 unto said tube.

It is obvious that changes may be made in the form, con truction and arrangement of the several par ts, as shown, within the scope of the appended claims, without-.departing from the spirit of the invention, and I do not therefore limit myself to the construction and arrangementshown and described herein.

\Vhat I claim as new, and desire to secure by Letters Patent of the United States, is:

1. A device of the class described, comprising a fuse-link and a cylindrical tube, the latter being provided with a plurality of downwardly extending insulating projections formed integrally therewith, end-caps mounted upon said tube and being likewise provided with downward projections, members substantially of the shape as a figure 8, formed with an upper partial flange engaging the said fuse-link and adapted to close the electrical circuit by having their lower portions mounted in suitable clips forming part of the external circuit, substantially as and for the purpose set forth.

2. A device of the class described, comprising a cylindrical tube, a couple of inner downwardly extending projections formed integrally therewith; caps threaded upon said tube and being provided with central openings, the latter being closed by a transparent medium; electrically connecting members formed substantially as an 8, and having their upper ends encased in the said tube, the latter being arranged with slits at its bottom for the purpose of securely holding nection with a fuse-linl -me111ber, and a bolt securing the latter to the said flaps, substantially as and for the purpose set forth.

3. A two-layer tube of a substantially cylindrical shape, provided at its lower sur" face with a couple of slits, the latter being adapted to receive and securely'hold two current-connecting members, each substantially shaped as an 8, the upper section of the said members being formed with a partial flange adapted to engage with a fuselin-k; end-caps mounted upon said tube, the former being provided with downwardly extending projections, the latter in parallel with similar projections formed uponthe said tube adjacent the slits, the said projections serving as insulating means in operating and manipulating the said cartridgefuse; the said end-caps being provided with central openings in orderto permit inspection of the condition of the interior of the said tube, substantially as and for the purpose set forth. i

Signed at New York city in the county of New York and State of New York this 2nd.

day of September, A. D. 1927.

REGNAR TERRILD.

ioo

the said connecting members by engaging these at their narrow middle sections, each of the said connecting members having disposed upon the outer side of their upper encased portions downwardly extending flaps, each of the said flaps being formed with a tapped bore in order to establish con- 

